Energy & Fuels, Vol.34, No.3, 3640-3648, 2020
Thermodynamic Analysis, Kinetics Modeling, and Reactor Model Development for Acetic Acid Hydrogenation Reaction over Bimetallic Pt-Sn Catalyst
In present work, experiments for gas-phase acetic acid hydrogenation were conducted over SiO2-Al2O3 supported platinum-tin (Pt-Sn) catalysts. These experimental data were used to model the kinetics of acetic acid hydrogenation reaction based on two-site Langmuir-Hinshelwood-Hougen-Watson kinetic model. Kinetic parameters were determined, and excellent matches were found between the model calculated results and experimental data. In order to get a better insight into the effect of process parameters on conversion and selectivity and spontaneity of reaction, a thermodynamic model was developed. Based on the thermodynamic model, reaction operating parameters were determined and pressure above 15 bar, H-2/acetic acid ratio (H-2/Ac) greater than 5, and lowest operating temperature were found to be the best operating regime for acetic acid hydrogenation reaction. Further, the kinetic model was implemented in one-dimensional and two-dimensional models of the catalytic fixed-bed adiabatic reactor to accurately predict catalyst and reactor behavior, and temperature effects on the reactor performance in experimental conditions. Using these models, the effects of inlet temperature, pressure, concentration, and temperature distribution behavior in catalyst bed are illustrated.